Look at it this way. As a lawyer (solicitor or barrister) the way you present to your client is incredibly important, and that applies to your appearance as well as how you act. If I turn up to a conference in shorts and with my hair coloured blue, I would fully expect my client to be unhappy with that even though it doesn't change my ability to give legal advice. The view of your employer (or Chambers, if you're a barrister) is important as well, because you are representing their brand in the work that you do. You might consider a tattoo, or a particular tattoo, to still look professional, but broadly speaking the view of the client matters more than your view. I know of a few lawyers that have tattoos, but I can't immediately think of any that have visible tattoos when they are wearing work attire. You may have a tattoo that is visible during the working day, and it may be that it never causes you any issues either with your employer or clients, but to my mind I just don't see why you would take that risk for something that is entirely optional, and which presumably can be put somewhere that is not visible if you really do want a tattoo that badly.